Can I call OnCollisionEnter() for an object from another object?

I have a player struct with a gameobject, transform, necessary values, and a weapon. I want to call OnCollisionEnter for my weapon from my player.

I am trying to think out how to detect a collision. I want to get the values from the player, the weapon, and the effected enemy without running a function that searches through names or something to find a match.

I'm not sure how abstract this is, feel free to ask questions